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How long is a day on Pluto?
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Pluto
Pluto as observed by the New Horizons spacecraft, July 13, 2015.
A day on Pluto, defined as its sidereal rotation period, lasts 6.3873 Earth days.1
Pluto rotates in a retrograde direction, meaning it spins in the opposite direction of the Sun and most planets; consequently, an observer on its surface would see the Sun rise in the west and set in the east. Its mean solar day is 6.3874 Earth days.1